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The equations do the same thing but in different units: The first formula gives speed in miles per hour. The second gives speed in whatever units you used for tire circumference, per minute, e.g. inch/min, ft/min, miles/min, etc., since the units are not specified in the description.
i usually have to use inches and millimeters to calculate tire circumference in inches based upon the bast*rdized units of tire size, e.g. 175/70-13, then can divide by 12 to convert to feet for calculation purposes. e.g.
Ct= 3.14 x [13 + [2 x (175 x .7 / 25.4)]] inches
Last edited by kennybobby; 02-12-2014 at 02:33 PM..
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